Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
  • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
  • F41A21/32—Muzzle attachments or glands
  • F41A21/325—Mountings for muzzle attachments
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
  • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
  • F41A21/32—Muzzle attachments or glands
  • F41A21/36—Muzzle attachments or glands for recoil reduction ; Stabilisators; Compensators, e.g. for muzzle climb prevention

Definitions

• muzzle accessory It is common to attach different types of muzzle accessories to the barrel of a firearm, such as, for example, a handgun.
• One such muzzle accessory is a compensator (or muzzle brake).
• Compensators typically operate by redirecting a portion of discharge gasses upwardly from the muzzle of a firearm, thereby reducing (or compensating for) unwanted upward motion of the firearm caused by recoil forces.
• a flash suppressor is another type of muzzle accessory that reduces the visible signature of a firearm by cooling or dispersing hot discharge gases that exit the muzzle.
• a silencing muzzle accessory also known as a silencer or suppressor operates to modify and/or reduce the acoustic amplitude of a gunshot.
• Typical methods for attaching muzzle accessories to firearm barrels have proved unsatisfactory.
• some muzzle accessories are provided with threaded holes that allow them to be screwed onto threaded barrels using high torque. Shims or crush washers are used to allow for proper alignment of such devices while maintaining adequate torquing force during installation.
• one or more set screws are provided to apply lateral frictional forces to barrels to prevent rotation of muzzle accessories after alignment.
• US2007095198 relates to firearms, and more particularly to facilities for mounting on the muzzle a device, such as a sound suppressor, muzzle brake, recoil compensator or blank firing adapter.
• US10480889B1 relates to a firearm having an integrated recoil booster facilitating a quick detach suppressor system and smaller suppressor.
• EP2786087 relates to a silencer for a firearm, such as a rifle or a pistol, where the silencer comprises a substantially cylindrical casing and where the silencer is intended to be releasably connected to an attachment element which is mounted on the barrel of the firearm.
• Various embodiments of the present invention provide compact muzzle accessories and muzzle accessory assemblies that are capable of quick and easy alignment, installation and removal with little effort and without need for specialized tools.
• a muzzle accessory as defined by claim 1.
• the muzzle accessory further includes a biased detent assembly configured to prevent the lock from being positioned into the unlocked position.
• the firearm barrel is locked rotationally with respect to the main body when the lock is in the locked position.
• the lock includes a head having a keyed bore, the keyed bore aligning with the keyed receptacle of the main body when the lock is in the unlocked position.
• the coupling of the firearm barrel includes a plurality of lugs and the keyed receptacle of the main body includes a plurality of first slots respectively receiving the plurality of lugs.
• the keyed bore of the lock includes a plurality of second slots respectively aligned with the first slots of the keyed receptacle when the lock is in the unlocked position.
• the muzzle accessory further includes a pin and the lock further includes a spirally-extending slot having a lower surface and a pin stop, the pin engaging the pin stop in the unlocked position.
• the lower surface of the spirally-extending slot includes a resting surface, the pin engaging the resting surface when the lock is in the locked position.
• a distance from the axis of rotation to the lower surface of the spirally-extending slot decreases gradually from the pin stop to the resting surface.
• the pin engages the lower surface of the spirally-extending slot with increasing friction as the lock is rotated from the unlocked position to the locked position.
• a muzzle accessory for coupling to a firearm barrel, the firearm barrel including a chamber for receiving a firearm round, a firing tube extending distally from the chamber, and a coupling at a distal end of the firing tube, the muzzle accessory including a main body having a proximal end, a distal end, a through-channel extending longitudinally between the proximal end and the distal end, a keyed receptacle within the through-channel positioned to engage the coupling of the firearm barrel when the firearm barrel is inserted into the through-channel, and a slot; and a lock within the slot of the main body, the lock being positionable into an unlocked position to permit insertion of the barrel within the through-channel of the main body, the lock being further positionable into a locked position to prevent removal of the firearm barrel from the main body after the firearm barrel is inserted into the through-channel.
• a muzzle accessory for coupling to a firearm barrel, the muzzle accessory including a main body having a proximal end, a distal end, a through-channel extending longitudinally between the proximal end and the distal end, a keyed receptacle within the through-channel, and a slot; and a lock within the slot of the main body, the lock having a keyed bore, the lock being positionable into an unlocked position and a locked position, in which the keyed bore aligns with the keyed receptacle of the main body when the lock is in the unlocked position, and the keyed bore does not align with the keyed receptacle of the main body when the lock is in the locked position.
• range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the subject disclosure. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6 etc., as well as individual numbers within that range, for example, 1, 2, 2.7, 3, 4, 5, 5.3, and 6. This applies regardless of the breadth of the range.
• Muzzle accessory assembly 100 includes a firearm barrel 200 having a proximal chamber 205 for receiving a firearm round and a rifled firing tube 210 extending distally from chamber 205 and having a coupling 215 at a distal end thereof, and a quick-connect muzzle accessory 300 releasably coupled to the distal end of firing tube 210 via coupling 215.
• barrel 200 is a handgun barrel configured for coupling to a handgun slide 1000 (see FIGS. 10 and 11 ), though it should be appreciated that barrel 200 and accessory 300 may be shaped and sized differently to fit any type of firearm, such as, for example, a rifle or a shotgun.
• coupling 215 of barrel 200 includes a key 230 having three radially extending lobe-shaped lugs 235a, 235b, 235c spaced 120 degrees apart circumferentially, and an annular slot 220 proximal of key 230.
• key 230 with lugs 235a, 235b, 235c is shaped to mate closely with a corresponding keyed receptacle 445 of quick-connect muzzle accessory 300.
• key 230 of barrel 200 may include more or less than three lugs 235 and lugs 235 may be sized and shaped differently from one another to accommodate a differently sized and shaped keyed receptacle 445. It should also be appreciated that lugs 235 may be spaced at any orientation circumferentially about the outer surface of barrel 200, and that various embodiments of the subject disclosure are not intended to be limited to any particular number, size, shape or circumferential spacing of lugs 235.
• quick-connect muzzle accessory 300 includes a main body 400, a lock 500 slidably positioned within main body 400 and rotatable therein about a longitudinal axis of rotation 900, a pin 600 for guiding limited rotation of lock 500 within main body 400, and a biased stop assembly 700 for preventing inadvertent unlocking of lock 500.
• a lock 500 slidably positioned within main body 400 and rotatable therein about a longitudinal axis of rotation 900
• a pin 600 for guiding limited rotation of lock 500 within main body 400
• a biased stop assembly 700 for preventing inadvertent unlocking of lock 500.
• quick-connect muzzle accessory 300 is a compensator structured to redirect exhaust gasses of a fired round to reduce upward travel of a firearm caused by recoil forces, though it should be appreciated that accessory 300 may include other types of muzzle accessories, such as, for example, flash guards/cones or silencers (also known as suppressors), and that various embodiments of the subject disclosure are not intended to be limited to any particular type of accessory.
• Main body 400 of quick-connect muzzle accessory 300 includes a proximal end 405, a distal end 410, a lower end 415, an upper end 417, a proximal wall 420 and a proximally-facing mid-face 425 both formed by a blind slot 430 extending into main body 400 from lower end 415, a bore 435 extending longitudinally through proximal wall 420 for closely receiving the outer surface of firing tube 210 of barrel 200, a through-channel 440 extending longitudinally through main body 400 from mid-face 425 to distal end 410, a keyed receptacle 445 having three radially extending lobe-shaped slots 450a, 450b, 450c spaced 120 degrees apart circumferentially about through-channel 440 for receiving lugs 235a, 235b, 235c of barrel 200, proximally facing stopping surfaces 455a, 455b positioned within through-channel 440, a transverse and upwardly facing vent 460 communicating with through
• slots 450 may be provided to match the number, position, shape and size of lugs 235, and that various embodiments of the subject disclosure are not intended to be limited to any particular number, position, shape or size of slots 450.
• Biased stop assembly 700 is press-fit into receptacle 470 and includes a housing 710 and a ball-tip 705 biased proximally by a biasing member (not shown), such as a spring, situated within housing 710. In the event of breakage or other occurrence requiring replacement of biased stop assembly 700, assembly 700 may be removed from main body 400 by inserting the tip of an appropriately sized tool proximally within access port 475 to urge assembly 700 out of receptacle 470.
• biased stop assembly 700 is press-fit into receptacle 470, it should be appreciated that assembly 700 may be maintained within receptacle 470 via other methods, such as, for example, via screw threads, in which case assembly 700 may be removed from main body 400 by unscrewing.
• Pin 600 extends through pin receipt bore 465 and across blind slot 430. Pin 600 is maintained fixedly within pin receipt bore 465 via screw threads (not shown), though it should be appreciated that pin 600 may be maintained within bore 465 via other methods, such as, for example, via a press-fit, and that various embodiments of the subject disclosure are not intended to be limited to any particular method for maintaining pin 600 within pin receipt bore 465.
• Lock 500 includes a lower body 505 having a laterally directed face 512 and opposed side walls 515a, 515b (with horizontal stopping surface 517), a disk-shaped head 520 extending upwardly from lower body 505, a keyed bore 525 extending longitudinally through head 520 and having three radially extending lobe-shaped slots 530a, 530b, 530c spaced 120 degrees apart circumferentially for receiving lugs 235a, 235b, 235c of barrel 200, a spirally-extending guide slot 535 forming a biasing tab 540, lower and upper slot surfaces 545, 550, respectively, for receiving pin 600 and a pin stop 555, a resting surface 560 formed in lower slot surface 545, and an access slot 565.
• Disk-shaped head 520 of lock 500 is slidably positioned within blind slot 430 of main body 400 and rotatable therein about axis of rotation 900 between an unlocked position, at which pin 600 engages with pin stop 555 (see FIG. 5 ), and a locked position, at which pin 600 engages with resting surface 560 and stopping surface 517 of side wall 515b engages with the lower side of proximal wall 420 to prevent over rotation of lock 500 past the locked position ( see FIG. 4 ).
• lobe-shaped slots 450a, 450b, 450c of main body 400 align with lobe-shaped slots 530a, 530b, 530c of lock 500 to permit insertion of barrel 200 (with correspondingly aligned lobe-shaped lugs 235 of key 230) distally through bore 435 and into through-channel 440 of main body 400.
• Stopping surfaces 455a, 455b engage with distally-facing sides of lugs 235b, 235c, respectively, to prevent over-insertion of barrel 200 and ensure proper longitudinal alignment of barrel 200 with respect to quick-connect muzzle accessory 300.
• lock 500 is rotated by hand about axis of rotation 900 to the locked position, thereby causing lobe-shaped slots 530a, 530b, 530c to come out of alignment with slots 450a, 450b, 450c of main body 400.
• the distally facing surface of head 520 engages with the proximally facing sides of lugs 235a, 235b, 235c to firmly lock barrel 200 longitudinally within through-channel 440 of main body 400.
• resting surface 560 engages with pin 600 to maintain lock 500 in the locked position and prevent inadvertent unlocking due to, for example, firearm discharge forces, droppage or entanglement with environmental objects.
• ball tip 705 of biased stop assembly 700 engages with laterally directed face 512 to provide a secondary mechanism for preventing inadvertent rotation of lock 500 into the unlocked position. It should be appreciated, however, that either or both of resting surface 560 and biased stop assembly 700 may be employed and/or other structures/mechanisms for preventing inadvertent unlocking of lock 500, and that various embodiments of the subject disclosure are not intended to be limited to any particular mechanism(s) for preventing inadvertent unlocking of lock 500.
• Spirally-extending guide slot 535 of lock 500 is structured such that a linear distance from axis of rotation 900 to lower slot surface 545 decreases gradually from a distance L1 at a position immediately adjacent pin stop 555 to a distance L2 at resting surface 560 ( see FIG. 6 ).
• pin 600 engages lower slot surface 545 with increasing friction, causing biasing tab 540 to displace slightly laterally (with greatest lateral displacement occurring in the locked position when pin 600 engages with resting surface 560).
• This causes lock 500 to exert an opposing force on barrel 200 at least partially along direction 910 ( see FIGS.
• barrel 200 is locked and maintained firmly at the correct rotational orientation via friction, thereby eliminating any rotational play of muzzle accessory 300 about barrel 200 that may result, for example, from design tolerances, wear and tear of contact surfaces, etc.
• the height 240 of lug 235b is shortened slightly relative to the depth 485 of lobe-shaped slot 450b to ensure that lug 235b engages with slot 450b at inflection points 245a, 245b when the opposing force is directed on barrel 200 along direction 910 ( see FIG. 12 ). In this manner, rotation of lock 500 into the locked position acts also to self-align muzzle accessory 300 rotationally with respect to barrel 200.
• spirally-extending guide slot 535 may be designed longer, thereby allowing the linear distance from axis of rotation 900 to lower slot surface 545 to decrease more gradually from pin stop 555 to resting surface 560.
• various embodiments of the subject disclosure are not intended to be limited to any particular length of guide slot 535.
• resting surface 560 of lock 500 may be oriented perpendicularly to direction 910, though it should be appreciated that various embodiments of the subject disclosure are not intended to be limited to any particular orientation of resting surface 560.
• a pin-like tool (not shown) is inserted laterally into access slot 565 until the tip of the tool covers the ball tip 705 of biased stop assembly 700.
• a distally directed force is then applied by the tool to urge ball tip 705 distally into housing 710 of biased stop assembly 700 until ball tip 705 clears laterally directed face 512 of lock 500.
• An upwardly directed prying force is then applied to the tool to rotate lock 500 into the unlocked position.
• barrel 200 may be slid and removed proximally from accessory 300.
• Muzzle accessory assembly 1100 includes a firearm barrel 1200 having a proximal chamber 1205 for receiving a firearm round and a rifled firing tube 1210 extending distally from chamber 1205 and having a coupling 1215 at a distal end thereof, and a quick-connect muzzle accessory 1500 releasably coupled to the distal end of firing tube 1210 via coupling 1215.
• a firearm barrel 1200 having a proximal chamber 1205 for receiving a firearm round and a rifled firing tube 1210 extending distally from chamber 1205 and having a coupling 1215 at a distal end thereof
• a quick-connect muzzle accessory 1500 releasably coupled to the distal end of firing tube 1210 via coupling 1215.
• barrel 1200 is a handgun barrel configured for coupling to handgun slide 1000, though it should be appreciated that barrel 1200 and accessory 1500 may be shaped and sized differently to fit any type of firearm, such as, for example, a rifle or a shotgun.
• coupling 1215 of barrel 1200 includes a key 1230 having three radially extending lobe-shaped lugs 1235a, 1235b, 1235c spaced 120 degrees apart circumferentially, and an annular slot 1220 proximal of key 1230 and forming distally-facing annular face 1225.
• key 1230 with lugs 1235a, 1235b, 1235c is shaped to mate closely with a corresponding keyed receptacle 1725 of quick-connect muzzle accessory 1500.
• key 1230 of barrel 1200 may include more or less than three lugs 1235 and lugs 1235 may be sized and shaped differently from one another to accommodate a differently sized and shaped keyed receptacle 1725. It should also be appreciated that lugs 1235 may be spaced at any orientation circumferentially about the outer surface of barrel 1200, and that various embodiments of the subject disclosure are not intended to be limited to any particular number, size, shape or circumferential spacing of lugs 1235.
• Quick-connect muzzle accessory 1500 includes a main body 1700, a lock 1600 arranged to rotate with respect to main body 1700 about longitudinal axis of rotation 900, a pin 1800 for guiding limited rotation of lock 1600 with respect to main body 1700, and a biased stop assembly 1900 for preventing inadvertent unlocking of lock 1600.
• a lock 1600 arranged to rotate with respect to main body 1700 about longitudinal axis of rotation 900
• a pin 1800 for guiding limited rotation of lock 1600 with respect to main body 1700
• a biased stop assembly 1900 for preventing inadvertent unlocking of lock 1600.
• quick-connect muzzle accessory 1500 is a compensator structured to redirect exhaust gasses of a fired round to reduce upward travel of a firearm caused by recoil forces, though it should be appreciated that accessory 1500 may include other types of muzzle accessories, such as, for example, flash guards/cones or silencers (also known as suppressors), and that various embodiments of the subject disclosure are not intended to be limited to any particular type of accessory.
• Main body 1700 includes a lower body 1705 having a laterally directed face 1712 and opposed side walls 1715a, 1715b (with horizontal stopping surface 1717), a head 1720 extending upwardly from lower body 1705, a keyed receptacle 1725 extending longitudinally through head 1720 and having three radially extending lobe-shaped slots 1730a, 1730b, 1730c spaced 120 degrees apart circumferentially for receiving lugs 1235a, 1235b, 1235c of barrel 1200, a pin receipt bore 1740 for fixedly receiving pin 1800, and an access slot 1745.
• FIG. 17 shows a main body 1700 having three lobe-shaped slots 1730a, 1730b, 1730c positioned to respectively receive lugs 1235a, 1235b, 1235c of barrel 1200
• any number of slots 1730 may be provided to match the number, position, shape and size of lugs 1235, and that various embodiments of the subject disclosure are not intended to be limited to any particular number, position, shape or size of slots 1730.
• Lock 1600 of quick-connect muzzle accessory 1500 includes a proximal end 1605, a distal end 1610, a lower end 1615, an upper end 1617, a proximal wall 1620 with proximally-facing surface 1622, a proximally-facing mid-face 1625, a blind slot 1630 for receiving head 1720 of main body 1700, a through-channel 1640 extending longitudinally from mid-face 1625 to distal end 1610, a keyed bore 1645 having three radially extending lobe-shaped slots 1650a, 1650b, 1650c spaced 120 degrees apart circumferentially for respectively receiving lugs 1235a, 1235b, 1235c of barrel 1200, a spirally-extending guide slot 1680 forming a biasing tab 1685, lower and upper slot surfaces 1690, 1695, respectively, for receiving pin 1800, a pin stop 1696, a resting surface 1697 formed in lower slot surface 1690, a transverse and upwardly facing vent 1660 communicating with through
• FIGS. 13-18 shows a lock 1600 having three lobe-shaped slots 1650a, 1650b, 1650c positioned to receive lugs 1235a, 1235b, 1235c of barrel 1200, it should be appreciated that any number of slots 1650 may be provided to match the number, position, shape and size of lugs 1235, and that various embodiments of the subject disclosure are not intended to be limited to any particular number, position, shape or size of slots 1650.
• Biased stop assembly 1900 is press-fit into receptacle 1670 of lock 1600 and includes a housing 1910 and a ball-tip 1905 biased proximally by a biasing member (not shown), such as a spring, situated within housing 1910.
• a biasing member such as a spring
• assembly 1900 may be removed from lock 1600 by inserting the tip of an appropriately sized tool proximally within access port 1675 to urge assembly 1900 out of receptacle 1670.
• biased stop assembly 1900 is press-fit into receptacle 1670, it should be appreciated that assembly 1900 may be maintained within receptacle 1670 via other methods, such as, for example, via screw threads, in which case assembly 1900 may be removed from lock 1600 by unscrewing.
• Pin 1800 extends into pin receipt bore 1740 of main body 1700.
• Pin 1800 is maintained fixedly within pin receipt bore 1740 via screw threads (not shown), though it should be appreciated that pin 1800 may be maintained within bore 1740 via other methods, such as, for example, via a press-fit, and that various embodiments of the subject disclosure are not intended to be limited to any particular method for maintaining pin 1800 within pin receipt bore 1740.
• Head 1720 of main body 1700 is slidably positioned within blind slot 1630 of lock 1600, such that lock 1600 is rotatable with respect to main body 1700 about axis of rotation 900 between an unlocked position, at which pin 1800 engages with pin stop 1696 (see FIG. 17 ), and a locked position, at which pin 1800 engages with resting surface 1697 and stopping surface 1717 of side wall 1715b engages with the lower side of proximal wall 1620 to prevent over rotation of lock 1600 past the locked position (see FIG. 16 ).
• lobe-shaped slots 1650a, 1650b, 1650c of lock 1600 align with lobe-shaped slots 1730a, 1730b, 1730c of main body 1700 to permit insertion of barrel 1200 (with correspondingly aligned lobe-shaped lugs 1235a, 1235b, 1235c) distally through keyed bore 1645 of lock 1600.
• Proximally-facing surface 1622 of wall 1620 engages with distally-facing annular face 1225 of barrel 1200 to prevent over-insertion of barrel 1200 and ensure proper longitudinal alignment of barrel 1200 with respect to quick-connect muzzle accessory 1500.
• lock 1600 is rotated by hand about axis of rotation 900 to the locked position, thereby causing lobe-shaped slots 1650a, 1650b, 1650c to come out of alignment with slots 1730a, 1730b, 1730c of main body 1700.
• the distally facing side of proximal wall 1620 engages with the proximally facing sides of lugs 1235a, 1235b, 1235c to firmly lock barrel 1200 longitudinally within quick-connect muzzle accessory 1500.
• resting surface 1697 engages with pin 1800 to maintain lock 1600 in the locked position and prevent inadvertent unlocking due to, for example, firearm discharge forces, droppage or entanglement with environmental objects.
• ball tip 1905 of biased stop assembly 1900 engages with laterally directed face 1712 of main body 1700 to provide a secondary mechanism for preventing inadvertent rotation of lock 1600 into the unlocked position. It should be appreciated, however, that either or both of resting surface 1697 and biased stop assembly 1900 may be employed and/or other structures/mechanisms for preventing inadvertent unlocking of lock 1600, and that various embodiments of the subject disclosure are not intended to be limited to any particular mechanism(s) for preventing inadvertent unlocking of lock 1600.
• spirally-extending guide slot 1680 of lock 1600 is structured such that a linear distance from axis of rotation 900 to lower slot surface 1690 decreases gradually from a position immediately adjacent pin stop 1696 to resting surface 1697.
• pin 1800 engages lower slot surface 1690 with increasing friction, causing biasing tab 1685 to displace slightly laterally (with greatest lateral displacement occurring in the locked position when pin 1800 engages with resting surface 1697).
• This causes lock 1600 to exert an opposing force on barrel 1200 to engage annular slot 1220 of barrel 1200 firmly against the inside surface of keyed receptacle 1725 of main body 1700.
• barrel 1200 is locked and maintained firmly via friction, thereby eliminating any rotational play of muzzle accessory 1500 about barrel 1200 that may result, for example, from design tolerances, wear and tear of contact surfaces, etc.
• Muzzle accessory assembly 2000 includes a firearm barrel 2200 having a proximal chamber 2205 for receiving a firearm round and a rifled firing tube 2210 extending distally from chamber 2205 and having a coupling 2215 at a distal end thereof, and a quick-connect muzzle accessory 2500 releasably coupled to the distal end of firing tube 2210 via coupling 2215.
• a firearm barrel 2200 having a proximal chamber 2205 for receiving a firearm round and a rifled firing tube 2210 extending distally from chamber 2205 and having a coupling 2215 at a distal end thereof
• a quick-connect muzzle accessory 2500 releasably coupled to the distal end of firing tube 2210 via coupling 2215.
• barrel 2200 is a handgun barrel configured for coupling to handgun slide 1000, though it should be appreciated that barrel 2200 and accessory 2500 may be shaped and sized differently to fit any type of firearm, such as, for example, a rifle or a shotgun.
• coupling 2215 of barrel 1200 includes a key 2230 having three radially extending lobe-shaped lugs 2235a, 2235b, 2235c spaced 120 degrees apart circumferentially, and an annular slot 2220 proximal of key 2230 and forming a distally-facing annular face 2225.
• key 2230 with lugs 2235a, 2235b, 2235c is shaped to mate closely with a corresponding keyed receptacle 2545 of quick-connect muzzle accessory 2500.
• key 2230 of barrel 2200 may include more or less than three lugs 2235 and lugs 2235 may be sized and shaped differently from one another to accommodate a differently sized and shaped keyed receptacle 2545. It should also be appreciated that lugs 2235 may be spaced at any orientation circumferentially about the outer surface of barrel 2200, and that various embodiments of the subject disclosure are not intended to be limited to any particular number, size, shape or circumferential spacing of lugs 2235.
• Quick-connect muzzle accessory 2500 includes a main body 2501 having a proximal end 2505, a distal end 2510, a lower end 2515, an upper end 2517, a proximally-facing surface 2520, a through-channel 2540 extending longitudinally through main body 2501 from surface 2520 to distal end 2510, a keyed receptacle 2545 having three radially extending lobe-shaped slots 2550a, 2550b, 2550c spaced 120 degrees apart circumferentially about through-channel 2540 for receiving lugs 2235a, 2235b, 2235c of barrel 2200, a transverse and upwardly facing vent 2560 communicating with through-channel 2540 at distal end 2510, a detent spring 2300, a detent spring receipt bore 2565 for fixedly receiving detent spring 2300, a laterally extending window 2570 adjacent detent spring 2300, and an internal receptacle 2575 having a lower stopping surface 2580a and an upper stopping surface 2580b.
• FIGS. 19-23 includes three lobe-shaped slots 2550a, 2550b, 2550c positioned to receive lugs 2235a, 2235b, 2235c of barrel 2200, it should be appreciated that any number of slots 2550 may be provided to match the number, position, shape and size of lugs 2235, and that various embodiments of the subject disclosure are not intended to be limited to any particular number, position, shape or size of slots 2550.
• muzzle accessory 2500 is first rotated counterclockwise about longitudinal axis 900 (when viewed distally from the proximal end of muzzle accessory assembly 2000) until lobe-shaped slots 2550a, 2550b, 2550c respectively align with lugs 2235a, 2235b, 2235c of barrel 2200. Barrel 2200 is then inserted longitudinally into through-channel 2540 until lugs 2235a, 2235b, 2235c enter internal receptacle 2575 and annular face 2225 abuts proximally-facing surface 2520 of muzzle accessory 2500. Muzzle accessory 2500 is then rotated clockwise into its proper orientation to lock muzzle accessory 2500 to barrel 2200 ( see FIGS.
• detent spring 2300 engages leading edge 2236a of lug 2235a, causing detent spring 2300 to displace laterally into window 2570.
• detent spring 2300 snaps back into its original position adjacent trailing edge 2237a of lug 2235a. In this position, detent spring 2300 prevents inadvertent free counterclockwise rotation of muzzle accessory 2500 with respect to barrel 2200, while lower and upper stopping surfaces 2580a, 2580b engage with lugs 2235a, 2235c, respectively, to prevent clockwise rotation of muzzle accessory 2500.
• muzzle accessory 2500 is rotated counterclockwise against the biasing force of detent spring 2300.
• Application of sufficient rotational force in the counterclockwise direction causes trailing edge 2237a of lug 2235a to engage and displace detent spring 2300 laterally into window 2560.
• Counterclockwise rotation of barrel 2200 continues until lugs 2235a, 2235b, 2235c respectively align with lobe-shaped slots 2550a, 2550b, 2550c of muzzle accessory 2500. Barrel 2200 is then removed longitudinally from muzzle accessory 2500.
• trailing edge 2237a of lug 2235a is steeper than leading edge 2236a.
• trailing edge 2237a is sufficiently steep to prevent rotational forces produced during operation of a firearm from inadvertently rotating muzzle accessory 2500 with respect to barrel 2200, but not so steep as to prevent a user from applying rotational force (e.g., by hand) to intentionally unlock muzzle accessory 2500 from barrel 2200.

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